Germany’s fantastic beaches are little-known wonders outside of the country. A friend who grew up in a town on the North Sea coast tells me that many Germans used to fly to Mallorca or mainland Spain, southern France, Italy, the Greek islands, or Turkey for their beach holidays, but in recent years northern European beach towns have been receiving more attention from vacationers. With intense heat waves and wildfires in southern Europe, and expanding environmental consciousness overall, more people have been choosing to travel closer to home — to beaches in Germany and Scandinavia. “My hometown is getting more visitors in the summers now. It’s definitely becoming more popular,” she remarks. These coastal towns and beaches are attractive and serene — ideal for relaxing and energizing holidays. It makes you wonder why they haven’t developed the renown of other beaches in modern times, despite all their natural beauty and charm. “Maybe we’re not as good at marketing,” my friend suggests. There is the marketing issue in some places, to be sure. Some beaches and resorts …